Egg cells are formed by meiosis of oocyte, and the specific process is as follows:
After prophase chromosome replication, the oocytes enter the first meiosis, and the homologous chromosomes are separated into 1 secondary oocytes and a collection, one large and one small.
Entering the second meiosis, similar to mitosis, the centromere divides into four cells. The second oocyte divides into a big egg, and the small one and the other group are divided into two groups to form three groups, each group contains half of the chromosome number of somatic cells.
Egg cells (eggs, eggs) are the reproductive cells of female organisms. Both animals and seed plants produce egg cells. In higher organisms, egg cells are produced by ovaries.
Human eggs will be expelled when they mature. Once combined with male sperm, it is possible to form fertilized eggs, form embryos and develop.